package com.talent.interceptor;

import com.talent.common.Constants;
import com.talent.config.JwtProperties;
import com.talent.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

/**
 * JWT拦截器
 */
@Component
@Slf4j
public class JwtTokenInterceptor implements HandlerInterceptor {

    @Autowired
    private JwtProperties jwtProperties;

    /**
     * 校验jwt
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            // 当前拦截到的不是动态方法，直接放行
            return true;
        }

        // 1、从请求头中获取令牌
        String token = request.getHeader("Authorization");
        if (token != null && token.startsWith("Bearer ")) {
            token = token.substring(7);
        }

        // 2、校验令牌
        try {
            log.info("JWT校验: {}", token);
            Claims claims = JwtUtil.parseJWT(jwtProperties.getSecretKey(), token);
            Long userId = Long.valueOf(claims.get(Constants.JWT_CLAIMS_USER_ID).toString());
            String username = claims.get(Constants.JWT_CLAIMS_USERNAME).toString();
            log.info("当前用户id: {}, 用户名: {}", userId, username);
            
            // 将用户信息存储到ThreadLocal中
            BaseContext.setCurrentUserId(userId);
            BaseContext.setCurrentUsername(username);
            
            // 3、通过，放行
            return true;
        } catch (Exception ex) {
            // 4、不通过，响应401状态码
            response.setStatus(401);
            return false;
        }
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        // 清理ThreadLocal
        BaseContext.removeCurrentUserId();
        BaseContext.removeCurrentUsername();
    }
}
